A large city resident who, due to smog pollution and over population, has mutated into rat-like behavior. Characteristics include: erratic driving, minuet patience, extreme cynicism, narcissism, ultra materialism, competitive without competition and shallow friendliness.

When driving on the freeway in the Los Angeles area, you easily spot a swamp rat, he's the guy in the BMW swerving in and out of lanes, tail gating or waiting until the last possible moment to merge so that he can get a whopping ten feet further in stop and go traffic.

A rare species of rodent which is of unusually large size and found in West Philadelphia. They are often ignorantly misjudged to be a opossum. Fear not, these creatures are nothing more than a rare and placid animal.

"that's a damn big swamp rat"
"you must have never seen a swamp rat before, that's nothing more than a yearling"
"Shit, that's some fucked up shit."